scholarly journals Refractive Index Sensor Based on Twisted Tapered Plastic Optical Fibers

Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 40 ◽  
Author(s):  
Teng ◽  
Deng ◽  
Liu ◽  
Yang ◽  
Yuan ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Simple Structure ◽  
External Medium ◽  
Low Cost ◽  
The Other ◽  
Refractive Index Sensor ◽  
Coupling Ratio ◽  
Plastic Optical Fibers ◽  
Drawing Method

We proposed a refractive index (RI) sensor employing two twisted tapered plastic optical fibers (POFs). The tapered POFs were fabricated by a heating and drawing method and were twisted around each other to form a coupled structure. The sensor consisted of two input ports, a twisted region, and two output ports. The tapered POF could make the light couple from one POF to the other easily. The twisted tapered POFs could constitute a self-referencing sensor, and by monitoring the changes of the coupling ratio, the variations of the external medium RIs could be measured. The RI sensing performances for the sensors with different fiber diameters and twisted region lengths were studied. The sensitivities of 1700%/RIU and −3496%/RIU in the RI ranges of 1.37–1.41 and 1.41–1.44 were obtained, respectively. The sensor is a low-cost solution for liquid RI measurement, which has the features of simple structure and easy fabrication.

D-Shaped Plastic Optical Fibers: Fabrication and Characterization as Refractive Index Sensor

2021 ◽  
Author(s):  
Thales Henrique Castro de Barros ◽  
Jose Eduardo Silva Sousa ◽  
Henrique Patriota Alves ◽  
Joaquim Ferreira Martins-Filho
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Refractive Index Sensor ◽  
Plastic Optical Fibers ◽  
Fabrication And Characterization

Low-Cost Refractive Index Sensor With Optical Fibers Attached to a U-Shaped Glass Tube

2018 ◽  
Vol 2 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Dipankar Chetia ◽  
Jayanta Madhab Gogoi ◽  
Hidam Kumarjit Singh ◽  
Tulshi Bezboruah
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Low Cost ◽  
Glass Tube ◽  
Refractive Index Sensor ◽  
Shaped Glass

scholarly journals D-Shaped POF Sensors for Refractive Index Sensing—The Importance of Surface Roughness

Sensors ◽  
2019 ◽  
Vol 19 (11) ◽  
pp. 2476 ◽  
Author(s):  
Filipa Sequeira ◽  
Nunzio Cennamo ◽  
Alisa Rudnitskaya ◽  
Rogério Nogueira ◽  
Luigi Zeni ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Refractive Index ◽  
Optical Fibers ◽  
Low Cost ◽  
Water Quality Assessment ◽  
Refractive Index Sensing ◽  
Plastic Optical Fibers ◽  
Index Changes ◽  
Low Cost Manufacturing ◽  
Scattering Losses

In this study the influence of the surface roughness on the transmission capacities of D-shaped plastic optical fibers (POFs) and sensors performance was investigated. Five D-shaped POF sensors were produced and characterized for refractive index sensing between 1.33 and 1.41. The sensors were characterized using a low-cost optical sensing system based on the variation of the transmitted light though the POF with refractive index changes (RI). Higher surface roughness increases the scattering losses through the POF and influences the sensors’ performance; therefore, a balance must be attained. Generally, the best performance was achieved when the sensing region was polished with P600 sandpaper as a final polishing step. Polishing with sandpapers of lower grit size resulted in lower scattering, higher linearity of the sensor response and generally lower performance for RI sensing. A sensor resolution of 10−3–10−4 RIU, dependent on the value of the external refractive index, was obtained through simple and low-cost manufacturing procedures. The obtained results show the importance of surface roughness in the development of POF sensors which can be used in several applications, such as for water quality assessment.

Low-Cost Sensing with Plastic Optical Fibers—From Turbidity and Refractive Index to Chemical Sensing

Proceedings ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 12
Author(s):  
Filipa Sequeira ◽  
Daniel Duarte ◽  
Rogério Nogueira ◽  
Lúcia Bilro
Keyword(s):  
Refractive Index ◽  
Quality Assessment ◽  
Optical Fibers ◽  
Chemical Sensing ◽  
Low Cost ◽  
Research Groups ◽  
Water Contaminants ◽  
Sensing Systems ◽  
Site Monitoring ◽  
Plastic Optical Fibers

This manuscript presents low-cost sensing systems for the monitoring of liquids, namely water and beverages quality assessment, with remote and in-site monitoring capabilities. The collaboration with several research groups allowed the development of smart optical platforms and low-cost sensors based on plastic optical fibers for the measurement of turbidity, color, refractive index and water contaminants.

Refractive index sensor based on SPR in symmetrically etched plastic optical fibers

2016 ◽  
Vol 246 ◽  
pp. 163-169 ◽  
Author(s):  
Yusser Al-Qazwini ◽  
A.S.M. Noor ◽  
Zaineb Al-Qazwini ◽  
Mohd H. Yaacob ◽  
S.W. Harun ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Refractive Index Sensor ◽  
Plastic Optical Fibers

All-POF Coupling Ratio-imbalanced SagnacInterferometer as Refractive Index Sensor

2021 ◽  
Author(s):  
HECTOR SANTIAGO-HERNANDEZ ◽  
Beethoven Bravo-Medina ◽  
Azael MORA-NUÑEZ ◽  
Jorge Flores ◽  
Guillermo García-Torales ◽  
...  
Keyword(s):  
Refractive Index ◽  
Refractive Index Sensor ◽  
Coupling Ratio

A low-cost liquid refractive index sensor based on plastic optical fibre and CCD array

2020 ◽  
Vol 31 (4) ◽  
pp. 047001
Author(s):  
Daniel P Duarte ◽  
Rogério N Nogueira ◽  
Lúcia B Bilro
Keyword(s):  
Refractive Index ◽  
Optical Fibre ◽  
Low Cost ◽  
Refractive Index Sensor ◽  
Ccd Array

scholarly journals Polymer Waveguide Coupled Surface Plasmon Refractive Index Sensor: A Theoretical Study

2020 ◽  
Vol 10 (4) ◽  
pp. 353-363
Author(s):  
Lanting Ji ◽  
Shuqing Yang ◽  
Rongna Shi ◽  
Yujie Fu ◽  
Juan Su ◽  
...  
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Low Cost ◽  
High Refractive Index ◽  
Waveguide Layer ◽  
Polymer Materials ◽  
Refractive Index Sensor ◽  
Polymer Waveguide ◽  
Compact Size ◽  
Potential Applications

Abstract A waveguide coupled surface plasmon sensor for detection of liquid with high refractive index (RI) is designed based on polymer materials. The effects of variation of the thickness of the Au film, polymethyl methacrylate (PMMA) buffer, and waveguide layer on the sensing performance of the waveguide are comprehensively investigated by using the finite difference method. Numerical simulations show that a thinner gold film gives rise to a more sensitive structure, while the variation of the thickness of the PMMA buffer and waveguide layer has a little effect on the sensitivity. For liquid with high RI, the sensitivity of the sensor increases significantly. When RI of liquid to be measured increases from 1.45 to 1.52, the sensitivity is as high as 4518.14nm/RIU, and a high figure of merit of 114.07 is obtained. The waveguide coupled surface plasmon RI sensor shows potential applications in the fields of environment, industry, and agriculture sensing with the merits of compact size, low cost, and high integration density.

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